I've noticed many Amazon Marketplace sellers asking 'high' (understatement of the year) prices, top sellers that sell hundreds of books every month (not necessarily the expensive ones though), some have millions of titles listed.
Amazon fees are quite high and the allowance given for p&p is not always enough to cover mailing etc so I can understand higher prices but am puzzled by this 'through the roof' pricing.
wireweaver there's nothing to stop you advertising your book there too, doesn't cost a penny unless it sells, you could undercut the others. I signed up and have listed stuff but no luck yet